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We have measured the temperature dependence of optical constants of InSb films including molten phases. It has been found that the optical constants differ between the as-sputtered amorphous and the molten states. Also, the optical constants exhibit the large change associated with the crystalline-to-molten phase transition. In the crystalline states, the extinction coefficient increases as the temperature increases. This temperature dependence can be explained by the decrease of the band gap energy.